UC知道桥梁工程专业英语部分翻译（2.7.y）
来源：百度知道 编辑：UC知道 时间：2024/06/17 20:48:26
Example 2.4: Qualitative profile design
A prestressed concrete slab bridge is to be reinforced with 10 post-tensioned tendons. The
preliminary profile for the tendons, illustrated in Fig. 2.14(a), results in insufficient
compressive stress in the top fibres of the bridge at B. It is required to determine an
amendment to the profile to increase the stress at this point without increasing the prestress
force.
In a determinate structure, stress at the top fibre can be increased by moving the
prestressing tendon upwards to increase the eccentricity locally. This increase in tendon
eccentricity, e, increases the (sagging) moment due to prestress, Pe, which increases the
compressive stress at the top fibre. However, in an indeterminate structure, the response of a
structure to such changes is not so readily predictable. In the structure of Fig. 2.14, increasing
the eccentricity locally at B without changing the sags, as illustrated in Fi
A prestressed concrete slab bridge is to be reinforced with 10 post-tensioned tendons. The
preliminary profile for the tendons, illustrated in Fig. 2.14(a), results in insufficient
compressive stress in the top fibres of the bridge at B. It is required to determine an
amendment to the profile to increase the stress at this point without increasing the prestress
force.
In a determinate structure, stress at the top fibre can be increased by moving the
prestressing tendon upwards to increase the eccentricity locally. This increase in tendon
eccentricity, e, increases the (sagging) moment due to prestress, Pe, which increases the
compressive stress at the top fibre. However, in an indeterminate structure, the response of a
structure to such changes is not so readily predictable. In the structure of Fig. 2.14, increasing
the eccentricity locally at B without changing the sags, as illustrated in Fi
例如2.4 ：定性形象设计
预应力混凝土板桥是要加强与10后张肌腱。那个
初步设定档的肌腱，说明图。 2月14日（一） ，结果在不足
压应力在顶端纤维大桥B.它需要确定一个
修改个人资料，以增加压力在这一点上不增加预应力
武力。
在一个确定的结构，应力顶部纤维可提高移动
预应力筋向上增加偏心当地。这增加肌腱
偏心，电子商务，增加了（低迷）目前由于预应力，聚乙烯，增加了
压应力上方纤维。然而，在一个不确定的结构，响应
结构，这种变化并非如此容易预测的。的结构图。 2月14日，越来越多
偏心当地的B不改变凹陷所示，图。 2月14日（ b ）项，不小
增加压应力顶部纤维在这一点。这是因为偏心
在B增加了在不增加肌腱凹陷的跨越。至于被视为以上，
相当于统一载入中由于预应力是一个功能只凹陷是，事实上，
不受偏心在两端跨度。因此，唯一的变化调整的结果
相当于点负载在A和B以及相当于载入中附近湾由于这些部队
正在达到或接近支持，他们不显着影响的分布弯矩
诱导预应力。更适当的修订的说明图。 2月14日（ c ）凡
配置文件是降低公司和BC ，同时保持其立场的支持点。这
的影响，增加肌腱凹陷增加的强度相当于统一
载入中。这样一个统一的向上载入中在两跨梁产生疲软的时刻
内部支持了预期的效果日益顶端纤维应力存在。
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图。 2.14Adjustment肌腱简介： （一）原始配置文件; （ b ）提高轮廓在B的线性
转化; （三）降低剖面AB和卑诗增加凹陷
最预应力作出了一系列的线和抛物线和相当于
载入中包括了一系列的点力量和阶层的统一载入中。这可以看出
在下面的例子。