滨江山地城市广场设计浅析——以重庆市城市广场为例

城市广场是人们进行交往、娱乐、休闲等活动的重要场所。由于滨江山地城市特殊的地理条件,其广场的设计有别于其他平原城市。本文以滨江山地城市——重庆朝天门广场设计为例来探讨滨江山地城市广场设计的特点。     

环境污染综合评价的数学模型

环境污染综合评价的问题,无论从环境科学本身或是从环境保护角度来看,都具有重要意义.过去常用的一些数学模式,各有特点.本文以系统分析的方式,建立了一个环境污染的分级综合评价模型,同时提出用二元对比排序法分配权值.     

设肋方形薄壁钢管混凝土短柱试验研究

为改善方形薄壁钢管混凝土矩柱的力学性能。本文提出了设置纵向劲肋的截面形式,进行了3种截面形式共有9个短柱试件的轴压试验。通过对各种截面形式短柱的试验现象、荷载-位移曲线及极限承载力等的研究,证明纵向加劲肋可有效提高薄壁钢管混凝土短柱的静力性能。     

FRP补强加固RC梁粘结破坏机理研究

根据FRP(Fiberreinforcedplastic)补强加固RC梁的试验结果,总结了FRP补强加固钢筋混凝土受弯构件早期破坏形态的过程和特点。FRP加固钢筋混凝土抗弯构件粘结界面的剪应力的分布在纤维截断点处存在较高的应力集中,随着离截断点距离的增大剪应力分布逐渐趋于均匀,粘结锚固长度不足和过高的应力集中是造成FRP加固钢筋混凝土构件早期破坏的主要原因。采用“齿”状块体力学计算模型和混凝土裂缝理论分析了FRP加固钢筋混凝土受弯构件时需要的有效锚固长度,并通过简化修正得出了FRP加固钢筋混凝土受弯构件最小锚固长度的计算公式,提出了FRP的容许应变值和避免FRP早期破坏应采取的措施,可供FRP加固工程设计和施工参考。     

Community response to environmental noise and the impact on cardiovascular risk score

Objective

The objective of our study was to investigate and evaluate the relationship between road traffic noise and cardiovascular risk.

Methods

The study sample (n = 659; 36.9% male, 63.1% female university students, mean age 22.83 ± 1.58 years) included a group exposed to road traffic noise (n = 280, L_eq,24 h = 67 ± 2 dB(A)) and a control group (n = 379, L_eq,24 h = 58.7 ± 6 dB(A)). Subjective response was determined by a validated noise annoyance questionnaire. The ten year risk of developing a coronary heart disease event was quantified as an evaluation of cardiovascular risk (SCORE60, Framingham 10-year risk estimation and projection to the age of 60, relative risk SCORE chart).

Results

Cardiovascular risk scores were significantly higher in the exposed group based on the Framingham scores projected to the age of 60, SCORE60 (AOR = 2.72 (95% CI = 1.21-6.15)) and the relative risk SCORE chart (AOR = 2.81 (1.46-5.41)).

Conclusions

These findings highlight the association between road traffic noise and cardiovascular risk.     

试论90平方米以下套型住宅的设计创新

“国六条”指导下的90平方米以下套型住宅设计,应该从理念、空间、技术、文化等方面进行创新,旨在让地产界在操作中更多追求住宅品质,以便更好的满足社会的需求。     

论现代图书馆建筑的灵活性——对当代中国图书馆建筑设计的探讨

本文探讨了中国图书馆建筑设计的方向,以及如何建造出具有我国特色的现代化图书馆建筑.文章提出了图书馆建筑灵活性的五个特点及其具备的条件和如何从图书馆建筑结构与建筑平面形状体现出灵活性。文章介绍和分析了西方图书馆模数式的优缺点并通过具体实例重点提出并讨论了如何结合我国的实际情况将模数式方法应用到我国图书馆建筑中的若干原则和方法.     

Examining spatially varying relationships between land use and water quality using geographically weighted regression I: model design and evaluation

Traditional regression techniques such as ordinary least squares (OLS) can hide important local variations in the model parameters, and are not able to deal with spatial autocorrelations existing in the variables. A recently developed technique, geographically weighted regression (GWR), is used to examine the relationships between land use and water quality in eastern Massachusetts, USA. GWR models make great improvements of model performance over OLS models, which is proved by F-test and comparisons of model R² and corrected Akaike Information Criterion (AIC_c) from both GWR and OLS. GWR models also improve the reliabilities of the relationships by reducing spatial autocorrelations. The application of GWR models finds that the relationships between land use and water quality are not constant over space but show great spatial non-stationarity. GWR models are able to reveal the information previously ignored by OLS models on the local causes of water pollution, and so improve the model ability to explain local situation of water quality. The results of this study suggest that GWR technique has the potential to serve as a useful tool for environmental research and management at watershed, regional, national and even global scales.     

方钢管混凝土柱-钢梁半刚性节点研究综述

文章介绍了目前方钢管混凝土柱-钢梁半刚性连接节点的形式,概述了近年来国内外关于方钢管混凝土柱-钢梁半刚性连接节点研究,提出方钢管混凝土柱-钢梁半刚性连接研究方向的一些看法和建议.     

N型方圆钢管相贯节点足尺试验研究

对两个承受支管轴力和主管轴力的搭接N型方圆钢管相贯节点进行了足尺试验研究。试验表明,试件N1的破坏模式为受压支管在节点处的局部屈曲破坏,试件N2的破坏模式为主管侧壁鼓曲破坏和支主管交接面主管壁压溃破坏的联合破坏模式。计算表明,试件N1的试验值与《钢结构设计规范》(GB 50017—2003)公式承载力计算结果的比值为0.73,与有限元计算结果的比值为1.11;试件N2的试验值与规范公式承载力计算结果的比值为0.99,与有限元计算结果的比值为1.02。研究表明,主管轴力对节点极限承载力影响较大,规范公式因未考虑主管轴力的影响,其计算结果偏不安全,还有待进一步的研究。